constant clicking noise in 95 altima

i have a 95 altima that just yesterday started making a non-stop clicking noise when in the on or start key positions. i took apart the dash/tapedeck area and found it was originating from a metal box with a white plastic end labeled "amp." this box is mounted to the floor between the gas pedal and the passenger side floor, and has a great many wires going into and coming out of it. anyone know what this module is? i found the car to be driveable with no apparent malfunction except for this incessant rythmic clicking. what could be causing this? any ideas are greatly appreciated! thanks!!

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daisy3774
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